Geoege milbank



(No Model.)

G. MILBANK. MEANS FOR ADJUSJING AND SUPPORTING MILLSTONES, &c. No. 275,929. Patented Apr.17,1883.

Invent/0r. $607676 :fi/ZIZZQ 224 fwzz waz UNITED STATES PATENT OFFICE.

GEORGE MILBANK, OF GHILLIGOTHE, MISSOURI.

MEANS FOR ADJUSTING AND SUPPORTING MILLSTONES, 84.0.

SPECIFICATION formingpart of Letters Patent No. 275,929, dated April 17, 1883,

Application filed February 28, 1882.

' millstones or similar disk or disks with relation to their shaft or spindle.

The main objects of this invention are, first, by the means hereinafter to be described, to adjust and support millstones so that their grinding-faces shall be parallel to each other, and at the same time at right angles to their spindle; second, to retain the said right-angle parallel relation between the stones and spindle, no matter what position the latter may assume. My invention therefore is designed to preventand guard against that unequal grinding action which takes place when the bedstone and runner are caused to grind finer on one side than the other, and to achieve a uniform and perfect grinding action, and consequent result of improved product. I attain the said objects by the mechanism illustrated in the accompanying drawings, in which- Figure l is a central sectional elevation of my improved machine. Fig. 2 is a top plan. Fig. 3 is an inverted plan of the mill above the plane ot'linea; w of Fig. 1; Fig. 4, a top plan of upper stone and the parts connecting it to the spindle. Fig. 5 is a section of the upper stone, showing a plan view of its universal gimbal-connection to the spindle; and Fig. 6 is a cross-section taken on line to w of Fig. 1.

A represents the timbers constituting the usual frame, upon which the operating parts are mounted. B is the bed-stone. O is the upper stone or runner. G is the spindle. This, as shown, passes through the eye or'center of both stones, the bed-stone having the journal-bearing, while the lower end of the spindle rests in a step, d, in manner as usual. As here illustrated the bed-stone is stationary and the upper stone is capable of revolving with the spindle; but by having toe and step at the other end of the spindle this arrangement can be reversed and the upper stone made stationary and the lower stone to revolve with the spindle, and the same adjusting devices, here- (No model.)

inafter to be described, may be used. I employ that mechanical device which is properly known as gimbals for supporting and connecting the bed-stone to the frame A, and a like gimbal-connection to support and connect the runner to the spindle. In both instances the said gimbal-connection consists of similarly-constructed parts, as follows: a circular ring, I), in the case of the bed-stone passes movably around its periphery, and has four equidistant journals or journal-bearings on its circumference. Thus the bed-stone has two journals or journalbearings, 11 b opposite each other to engage in two of the journals or journal-bearings in the ring I), and the other two journals or journal-bearings, b b, in the ring I) engage in like journals or bearings attached to the frame A. (See Figs. 1 and 2.) The bed-stone, therefore, by its universal gimbal-connection can oscillate in any direction in order to be made to assume, first, acorrect position with the spindle, and, second, to retain said position by following up any change of position on part of the spindle, as will hereinafter appear.

The upper universal gimbal-connection consists of the like circular ring, 0, with its journals or journal-bearings fixed inovably in the eye of the stone or disk between the spindle and disk, and is attached to spindle by two of its journals or bearings, 0 c resting on two like journals or bearings fixed to the spindle, while the disk rests on the ring 0 by two journals or bearings, 0 c, fixed to it in the eye, and engaging the other two of the journals or bearings of the ring. (See Figs. 1 and 5.) Hence the upper stone or disk can also oscillate frcel y in all directions in order to enable the operator to adjust and correctly position the runnerstone with the spindle, and also follow up with the bed-stone any change of position that the spindle may be forced to assume. The employment of the universal gimbal-counectiou in connection with millstones I do not claim, broadly; but my inventionconsists in the combination with said parts of' the further mechanism now to be described.

D D represent adjusting-arms, having their upper ends bolted to the under side of the bedstone. (See Figs. 1 and 3.) The lower ends of the said arms support a sleeve or follower, d,

which surrounds the spindle and freely permits the same to revolve. (See Figs. 1 and 6.) (l are set-screws passing through threaded holes in the lower ends of the arms D,in order to impinge against the outside of the follower d in the act of lateral adjustment of the arms. (See Figs. 1 and 6.) \Vedges can be substituted for the'set-screws, however.

Since the universal gimbal-connection affords the bed-stone freedom of motion, it is apparent that by tightening or loosening the lower set-screws or wedges the operator can raise or lower any side of the stone or adjust it to a correct position-via, at a right angle to its spindle-and this done secure the stone in said position. Thespindle can freely revolve without disturbing the set position of the bedstone; but as soon as the spindle is shifted to one side (which frequently occurs by a pull on part of the belt or other causes) the bedstone is forced to follow up said movement and the relation of the parts is maintained. The upper stone is likewise provided with a device to adjustably secure the stone, so that its face shall be retained parallel to that of the bedstone and at aright angle to the spindle. For said purpose I provide the upper stone or disk with aspider, E, consisting of an inner and an outer circular plate, 0 c, joined by radial arms 0 as shown in Figs. 1 and 4. By the outer circular plate the spider E is fastened to the eye of the stone. By its inner circular plate the said spider rests upon a sleeve, 0 which in turn isslipped on the upper end of the spindle and rests upon its annular shoulder, as shown. (See Figs. 1, 2, 4.)

f represents one or more set-screws, which pass through the threaded holes of the inner circular plate, and engage the outer annular surface of the sleeve. (See Figs. 1 and 4.) Here, also, wedges can be substituted for set-screws. By tightening or loosening the set-screws or wedges fthe adjustment andrequired position of the upper stone can be had and maintained.

The use of the sleeve 0 prevents the'necessity of disengaging the set-screws, and the spider, if need be, can be lifted from the spindle and replaced again without readjusting the setscrews. When both stones are properly adjusted and secured to be at a perfect right angle to the vertical condition of their shaft or spindle, the upper stone (in operation) freely revolves with the spindle, the lower one re maining stationary. In case any change of position on the part ofthe spindle occurs-say, its lower end is caused to shift to one side or the other-then both stones or disks move to gether at the same time and in the same direction with the said moving spindle. Consequently the faces of the stones or disks still remain parallel with each other, and the rightaugle relation between the said parts remain the same. In case of wear on one part of the step, or its being tipped to one side, or a sudden pull on the spindle takes placein short, no matter to what position the spindle is made to assun1e-the stones or disks will retain their said set position, so as to run in train, and grind the same on one side as on the other.

What I claim is-- 1. In combination with the spindle C, the upper disk, O, having the supporting-gimbals, the spider E, sleeve 0, and adjusting-screws, as described.

2. In combination with a bed-stone provided with gimbals and a spindle, G, the adjustingarins D, set-screws (Z and sleeve 61, as described.

3. In combination with the. spindle C, the bed-stone provided with gimbals and the adjusting-arms D, and the upper stone, 0, provided with gimbals and the adjusting-spider E, as shown.

GEORGE MILBANK.

Witnesses:

EDWARD GUDGEL, JOHN OOQNNELL. 

